I WAS DRIVING ON A SIDE STREET AT APPROXIMATELY 20MPH WHEN A VERY LOUD NOISE AND IMPACT TO THE BACK OF MY HEAD HAPPENED. I SWERVED AND SLAMMED THE BRAKES. AFTER I WAS STOPPED, I PUT THE VEHICLE IN PARK TO INVESTIGATE THE SITUATION. MY AHR (ACTIVE HEAD REST) HAD SPONTANEOUSLY DEPLOYED. I WAS NOT IN AN ACCIDENT. THE DEPLOYMENT STRUCK THE BACK OF MY HEAD WITH SUCH FORCE THAT IT SENT ME FORWARD. I INSTANTLY GOT A HEADACHE AND LASTED FOR 3 DAYS.*DT CONSUMER STATED HER HEAD "POPS" IF SHE IS STILL FOR A LONG PERIOD OF TIME AND MOVE FORWARD/DOWN.*JB